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Wireless network is not detected, says Disconnected - you are offline on start. This has started happening only after I updated Ubuntu 14.04 through Software Updater.

I did try with downgrading libnl those 3 files to 302.21-1 but no use. I tried with sudo services network-manager restart but no use.

Tried with uninstalling and reinstalling driver but no use.

I also tried with Advance recovery but no use.

Please help with this issue.

shaukat@shk-Inspiron-1545:~$ lspci -knn|grep Net -A2
0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
    Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c]

shaukat@shk-Inspiron-1545:~$ grep b43 /etc/modprobe.d/*
/etc/modprobe.d/blacklist-bcm43.conf:blacklist b43
/etc/modprobe.d/blacklist-bcm43.conf:blacklist b43legacy
/etc/modprobe.d/blacklist.conf:# replaced by b43 and ssb.
shaukat@shk-Inspiron-1545:~$

Regards, SHK

Pilot6
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SHK
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    Possible duplicate of [Why do I get "Required key not available" when install 3rd party kernel modules or after a kernel upgrade?](http://askubuntu.com/questions/762254/why-do-i-get-required-key-not-available-when-install-3rd-party-kernel-modules) – Pilot6 Aug 14 '16 at 10:25
  • Please [edit] your question and add output of `lspci -knn | grep Net -A2` terminal command. – Pilot6 Aug 14 '16 at 10:25
  • This is one command, not two. – Pilot6 Aug 14 '16 at 11:18
  • See also http://askubuntu.com/questions/55868/installing-broadcom-wireless-drivers – Pilot6 Aug 14 '16 at 11:19
  • Other one is not showing any result, i waited for at least 7-10 mins but there were no result. Please suggest if i try it again. Regards, Shk. – SHK Aug 14 '16 at 11:19
  • There are no 2 commands: one and the other. It was supposed to be run as one command. – Pilot6 Aug 14 '16 at 11:20
  • Please also run `grep b43 /etc/modprobe.d/*` – Pilot6 Aug 14 '16 at 11:36
  • My apologies, i am sending is now.. please suggest shaukat@shk-Inspiron-1545:~$ lspci -knn|grep Net -A2 0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01) Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c] shaukat@shk-Inspiron-1545:~$ grep b43 /etc/modprobe.d/* /etc/modprobe.d/blacklist-bcm43.conf:blacklist b43 /etc/modprobe.d/blacklist-bcm43.conf:blacklist b43legacy /etc/modprobe.d/blacklist.conf:# replaced by b43 and ssb. shaukat@shk-Inspiron-1545:~$ – SHK Aug 14 '16 at 13:33
  • Please paste it to your question. It is unreadable here. But it is clear what happened. – Pilot6 Aug 14 '16 at 13:40
  • This is a duplicate of http://askubuntu.com/questions/55868/installing-broadcom-wireless-drivers – Pilot6 Aug 14 '16 at 15:09

1 Answers1

1

A wrong driver is installed, it blacklisted the correct one.

If the firmware is installed, you can enable Wi-Fi by

sudo modprobe b43

You also need to remove the wrong driver by

sudo apt purge bcmwl-kernel-source
Pilot6
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